Character concept: kindly old mentor figure who is scouring the land in search of The Chosen One to pull the sword from the stone. They find the kid destined to be king, whisk them away on a magical adventure full of lessons like "be a good sport" and "always see the best in people," and guide them to the stone.
The child pulls the sword out and immediately gets knifed in the ribs by their mentor, who takes the sword, hides the body, and gets declared the rightful king.
Per the AD&D Monster Manual hill giants hurl rocks for 2-16 hp of damage, while stone giants inflict 3-30 hp (Stephen Hearon, "Dragon Mirth," Dragon 105, January 1986)
i bet when Arthur saw how Isolde last wish was to be hold by Tristan the man she loved deeply. he thought " this .. this is how i want to die, to be hold by the man i love "